Vitamin A Deficiency
Vitamin A Deficiency - Related Videos
01:30
Vitamins
0 Views •
2024
Vitamins, derived from the Latin word for life, are essential organic substances required in small quantities for optimal growth and overall well-being. Unlike other organic nutrients, vitamins don't act as sources of energy or building materials but rather facilitate these nutrients' utilization by the body. Vitamins are predominantly coenzymes, assisting enzymes in specific chemical actions, like the oxidation of glucose for energy involving B vitamins. Most vitamins are not produced in our...
12:48
PLGA Nanoparticles Formed by Single- or Double-emulsion with Vitamin E-TPGS
0 Views •
Cited by 211 •
2013
We describe the production and characterization of nanoparticles and microparticles composed of poly(lactic-co-glycolic acid) using vitamin E-TPGS as an emulsifier. By varying formulation parameters such as the concentration of emulsifier, it is possible to produce nanoparticles with mean diameters ranging from 220 nm to 1.98 µm.
04:55
A Simple Mechanical Procedure to Create Limbal Stem Cell Deficiency in Mouse
0 Views •
Cited by 11 •
2016
The following article provides an easy, reproducible technique to effectively create a sustainable mouse model of limbal stem cell deficiency (LSCD). This animal model is useful in testing and comparing the efficacy of treatments for limbal stem cell diseases.
01:25
Capital Deficiency in Liquidation: II
0 Views •
2026
A capital deficiency occurs when a partner's capital account has a debit balance during partnership liquidation. It may result from operating losses, excessive drawings, or losses from the sale of partnership assets. During liquidation, noncash assets are sold, liabilities are paid, gains or losses are allocated to the partners, and the remaining cash is distributed based on the partners' capital balances.Example: Ace Company decides to liquidate because it is nearing bankruptcy. Noncash assets...
01:30
No Capital Deficiency in Liquidation
0 Views •
2026
In accounting, liquidation without capital deficiency is a structured process that enables a partnership to dissolve equitably when partners possess sufficient capital to cover all liabilities and allocated losses. This condition ensures that no partner is required to contribute additional funds to the partnership, streamlining the dissolution procedure.The liquidation process begins with conversion of noncash assets into cash. When these assets are sold, any difference between the sale price...
FAQs
Inadequate vitamin A reduces the supply available to form retinal, the light-sensitive component of visual pigments. These pigments support vision in low-light conditions, so impaired retinal availability can interfere with dark adaptation and produce night blindness. This visual effect provides an important biological clue that vitamin A status is affecting photoreceptor function before more severe eye damage develops.
Vitamin A-derived retinoids help regulate gene expression, meaning they influence which cellular instructions are activated. When vitamin A supply is insufficient, this regulatory role can be disrupted in tissues that depend on retinoid signaling. The consequence extends beyond vision, helping explain why deficiency can affect epithelial maintenance and other biological functions.
Vitamin A supports the maintenance of epithelial tissues, which form protective linings and surfaces in the body. Deficiency can impair this maintenance while also weakening immune defense, creating a biological connection between tissue integrity and susceptibility to infection. Studying both effects shows why vitamin A deficiency is relevant to cellular biology as well as public health.
Night blindness and dry eyes can appear early, reflecting disruption of visual function and eye-surface maintenance. More severe deficiency may progress to xerophthalmia, a serious disorder involving the eye. Tracking this progression helps distinguish early functional changes from advanced tissue damage and emphasizes the value of recognizing symptoms before preventable illness becomes more severe.
Dietary assessment examines whether people may be receiving insufficient vitamin A through their food intake. It can help guide decisions about broader nutritional responses, including supplementation or food fortification. In biology and public health, this approach connects individual dietary patterns with physiological effects and helps target strategies intended to reduce preventable illness.
Children and pregnant individuals are specifically identified as important populations when studying strategies to reduce preventable illness related to vitamin A deficiency. Focusing research and public-health planning on these groups helps connect biological consequences, such as impaired vision or immune defense, with interventions such as dietary assessment, supplementation, and food fortification.